<template>

  <el-container class='home-container'>
    <el-header>
      <div>
        <img src='../assets/heima.png'>
        <span>好先森后台管理系统</span>
      </div>
      <el-button type="info" @click='logout'>退出</el-button>
      <!--页面主体区域-->
    </el-header>
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse?'64px':'200px'">
        <div class='toggle-button' @click="toggleCollapse">|||</div>
        <!--侧边栏菜单区-->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" unique-opened
          :collapse='isCollapse' :collapse-transition='false' router :default-active='activePath'>
          <!--一级菜单-->
          <!--动态index绑定的数据类型事字符串-->
          <el-submenu :index="item.id+''" v-for='item in menuList' :key='item.id'>
            <!--一级菜单模板区-->
            <template slot="title">
              <!--图标-->
              <i :class="iconsObj[item.id]"></i>
              <!--文本-->
              <span>{{item.authName}}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item :index="'/'+subItem.path+''" v-for='subItem in item.children' :key="subItem.id"
              @click="saveNavState('/'+subItem.path)">
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>

        </el-menu>
      </el-aside>
      <!--右侧内容主体-->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
  export default {
    data() {
      return {
        // 左侧菜单数据
        menuList: [],
        iconsObj: {
          '125': 'iconfont icon-user',
          '103': 'iconfont icon-tijikongjian',
          '101': 'iconfont icon-shangpin',
          '102': 'iconfont icon-danju',
          '145': 'iconfont icon-baobiao'
        },
        // 是否折叠
        isCollapse: false,
        // 被激活的链接地址
        activePath: ""

      }
    },
    // 页面一加载的时候就要获取一级菜单 
    created() {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
      logout() {
        // 清除本地存储
        window.sessionStorage.clear()
        this.$router.push('/login')
      },
      async getMenuList() {
        const {
          data: res
        } = await this.$http.get('menus');
        if (res.meta.status != 200) return this.$message.error(res.meta.message)
        this.menuList = res.data
      },
      // 点击按钮,实现 切换菜单的折叠于展开
      toggleCollapse() {
        this.isCollapse = !this.isCollapse;
      },
      saveNavState(activePath) {
        window.sessionStorage.setItem('activePath', activePath)
        this.activePath = activePath
      }
    }
  }

</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }

  .el-header {
    background-color: #373D41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;

    >div {
      display: flex;
      align-items: center;

      span {
        margin-left: 15px;
      }
    }
  }

  .el-aside {
    background-color: #333744;

    .el-menu {
      border-right: none;
    }
  }

  .el-main {
    background-color: #EAEDF1;
  }

  .iconfont {
    margin-right: 10px;
  }

  .toggle-button {
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    /* letter-spacing 属性增加或减少字符间的空白（字符间距）。 */
    letter-spacing: 0.3em;
    cursor: pointer;
  }

</style>
